Horween recomends Neatsfoot oil for Chromexcel. "The last step for Chromexcel is coat of Neatsfoot Oil, so when people ask me how to condition this leather, that’s always my first recommendation."
Its been around along time and is good for any leather. It will darken the leather slightly. I just re-applied some to my Danner Winter Lights. Water just beads off of them. Oh and I've had these boots for over 20 years.